Oracle

The command that executes the script is already mentioned in the previous section and is no longer duplicated.Sqlplus User/[email protected]:p ort/servicename @/path/sqltest.sql;Sqltest's content and notes:--This whenever indicates that after an

What happens to queries in Oracle if they are put into spark-local mode?Let's look at a case650) this.width=650; "src=" Https://s2.51cto.com/wyfs02/M02/96/63/wKiom1khB1HjbEjCAABbo2bzHxg831.png "title=" Clipboard.png "alt="

1, check the hardwareMemory# grep Memtotal/proc/meminfoSwap space# grep Swaptotal/proc/meminfoDisk space# Df-ah2, download softwareOracle Database 10g Release 2 (10.2.0.1) software download

Oracle 11g Virtual sub-partition experimentthe following two create statements are created successfully;Requirements Description:The project requires that 3 fields be partitioned, such as time, hours, and an area ID, to associate with the virtual

In my experience, the number one cause of deadlocks is a foreign key not indexed (the second reason is that the bitmap index on the table is being updated concurrently). In the following two cases, Oracle adds a full table lock to the child table

Use of the dual tableDual is an actual table in Oracle that can be read by any user, often in a SELECT statement block without a target table.--View Current connection user select User from dual;--View current date, time select Sysdate from

Implementing select Top N in Oracle:Because Oracle does not support the SELECT top statement, it is often used in Oracle with order by and RowNumTo implement the query for select top N.To put it simply, the implementation method is as follows:Select

The NOT NULL constraint can be defined only at the column level, and the name of the NOT NULL constraint may be specified, and the name is automatically generated if unspecifiedsql> CREATE TABLE T1 (x number not NULL, y number constraint nn_t111_y

CREATE TABLE Student(Sno Number (5) is not NULL,sname VARCHAR2 (),Idcard VARCHAR2 (),createtime DATE default sysdate,Nno Number (2),constraint Pk_student primary KEY (SNO));CREATE TABLE Course(CNO Number (5) is not NULL,CNAME VARCHAR2 (+),constraint

Question Answer:1. Why create a new account using the SYS account.A: Because SYS has DBA authority, and SYS is already in existence after installing Oracle, the password can be entered at random.2. Why not create a user using the SQL language?A: All

　　User management is one of the most basic tasks of the system administrator, the user wants to connect the database and use the corresponding system resources must be the legitimate users of the system and have corresponding permissions.1 Creating

*********** Importing (exporting) data with toolsTool (T)-"Export Table" (X)Tool (T)-"Export Table" (X)Selected Run File location:E:\oracle\product\10.2.0\db_1\bin\imp.exe (Exp.exe)********* command Import and ExportOracle Import DMP File command:(1)

Sqoop import \-doraoop.disabled=true \--connect jdbc:oracle:thin:@ "(Description= (address= (PROTOCOL=TCP) (host=xx. Xx. Xx. XX) (port=1521)) (Connect_data= (server=dedicated) (SERVICE_NAME=EDW))) "\--username ****\--password ****\--table SDI.

DescriptionA database trigger is a stored PL/SQL program that is associated with a table.Whenever a particular data manipulation statement (Insert,update,delete) is emitted on a specified table, Oracle itself actively runs the sequence of statements

Import Java.sql.connection;import Java.sql.drivermanager;import java.sql.sqlexception;import java.sql.Statement; Public classTest { Public Static voidMain (string[] args) throws ClassNotFoundException, SQLException {//1. Load DriverClass.forName

Oracle, in order to achieve the determination of the data is updated, a myriad of plug-in functions, to use the merge into to implement (the Oracle 9i introduced features), the syntax is as follows:This method is suitable for large data volume

Here are the conditionsLike and regexp_like conditionsHere is the functionRegexp_instrRegexp_replaceRegexp_substrSELECT * FROM Tis_ft_user_infowhere Regexp_like (Credential_number, ' ^5 ');There are four main functions in Oracle that support regular

Flash back area full:OS:RM-RF [Archivelog autobackup backupset controlfile Flashback Onlinelog]Eg:Archivelog autobackup backupset controlfile Flashback Onlinelog[Email protected] prod]$ CD autobackup/[[email protected] autobackup]$ ls2014_10_13 2014_

Binding Variables (binding variable), shared pool (pooled buffer pool), SGA(System global Area);Role: The SQL should be analyzed into soft analysis, reducing the resources and time spent on hard analysis.Java uses bound variables:Bulk Delete SQL by

General character Splitting methodSelectREGEXP_SUBSTR (Str,'[^,]+',1, Level)STR from(Select '11,12,13,14,15,16' Str fromdual) CONNECT by Level Regexp_count (Str,'[^,]+');To split with a special number character:line break, carriage return, TAB